66539 has 8 divisors (see below), whose sum is σ = 76032. Its totient is φ = 57640.

The previous prime is 66533. The next prime is 66541. The reversal of 66539 is 93566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66539 - 2⁴ = 66523 is a prime.

It is a plaindrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 66539.

It is not an unprimeable number, because it can be changed into a prime (66533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122 + ... + 384.

It is an arithmetic number, because the mean of its divisors is an integer number (9504).

2⁶⁶⁵³⁹ is an apocalyptic number.

66539 is a deficient number, since it is larger than the sum of its proper divisors (9493).

66539 is a wasteful number, since it uses less digits than its factorization.

66539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297.

The product of its digits is 4860, while the sum is 29.

The square root of 66539 is about 257.9515458376. The cubic root of 66539 is about 40.5221136157.

The spelling of 66539 in words is "sixty-six thousand, five hundred thirty-nine".